AudioCodes Mediant 800B User Manual page 289

User's Manual
Each Message Manipulation rule is configured with a Manipulation Set ID. You can create
groups (sets) of Message Manipulation rules by assigning each of the relevant Message
Manipulation rules to the same Manipulation Set ID. The Manipulation Set ID is used to
assign the rules to specific calls.

SBC application: Message manipulation rules can be applied pre- or post-
classification:
•
Pre-classification Process: Message manipulation can be done on incoming
SIP dialog-initiating messages (e.g., INVITE) prior to the classification process.
You configure this by assigning the Manipulation Set ID to the SIP Interface on
which the call is received (see Configuring SIP Interfaces on page 260).
•
Post-classification Process: Message manipulation can be done on inbound
and/or outbound SIP messages after the call has been successfully classified.
You configure this by assigning the Manipulation Set ID to the relevant IP Group
in the IP Group table (see Configuring IP Groups on page 263).

Gateway application: Message Manipulation rules are applied to calls as follows:
•
Manipulating Inbound SIP INVITE Messages: Message manipulation can be
applied only to all inbound calls (not specific calls). This is done by assigning a
Manipulation Set ID to the "global" ini file parameter,
GWInboundManipulationSet.
•
Manipulating Outbound SIP INVITE Messages:
a.
b.
The device also supports a built-in SIP message normalization feature that can be enabled
per Message Manipulation rule. The normalization feature removes unknown SIP message
elements before forwarding the message. These elements can include SIP headers, SIP
header parameters, and SDP body fields.
The SIP message manipulation feature supports the following:

Manipulation on SIP message type (Method, Request/Response, and Response type)

Addition of new SIP headers

Removal of SIP headers ("black list")

Modification of SIP header components such as values, header values (e.g., URI
value of the P-Asserted-Identity header can be copied to the From header), call's
parameter values

Deletion of SIP body (e.g., if a message body is not supported at the destination
network this body is removed)

Translating one SIP response code to another

Topology hiding (generally present in SIP headers such as Via, Record Route, Route
and Service-Route).

Configurable identity hiding (information related to identity of subscribers, for example,
P-Asserted-Identity, Referred-By, Identity and Identity-Info)

Apply conditions per rule - the condition can be on parts of the message or call's
parameters

Multiple manipulation rules on the same SIP message
Version 6.8
Message manipulation can be done for specific calls, by assigning a
Manipulation Set ID to an IP Group in the IP Group table, using the
'Outbound Message Manipulation Set' parameter.
Message manipulation can be applied to all outbound calls (except for IP
Groups that have been assigned a Manipulation Set ID). This is done by
assigning a Manipulation Set ID to the "global" ini file parameter,
GWOutboundManipulationSet.
289 Mediant 800B Gateway and E-SBC
18. SIP Definitions